for example i would like blog1 to have at most 3 revisions for each post
but i want blog2 can have at most 10 revisions since this blog may have more than one editors that i want to enable this blog to have more revision than blog1, how to do this?
wp-config.php only support for global revision, and can not be customize for each blogs, so should i implement this function by myself?
No,
wp-config.php
can have granular constants. Like this: